| 1 | // Copyright (C) 2016 The Qt Company Ltd. |
|---|---|
| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
| 3 | |
| 4 | #include "qcolortrclut_p.h" |
| 5 | #include "qcolortransferfunction_p.h" |
| 6 | #include "qcolortransfertable_p.h" |
| 7 | #include <qmath.h> |
| 8 | |
| 9 | QT_BEGIN_NAMESPACE |
| 10 | std::shared_ptr<QColorTrcLut> QColorTrcLut::create() |
| 11 | { |
| 12 | struct Access : QColorTrcLut {}; |
| 13 | return std::make_shared<Access>(); |
| 14 | } |
| 15 | |
| 16 | std::shared_ptr<QColorTrcLut> QColorTrcLut::fromGamma(qreal gamma) |
| 17 | { |
| 18 | auto cp = create(); |
| 19 | |
| 20 | for (int i = 0; i <= (255 * 16); ++i) { |
| 21 | cp->m_toLinear[i] = ushort(qRound(d: qPow(x: i / qreal(255 * 16), y: gamma) * (255 * 256))); |
| 22 | cp->m_fromLinear[i] = ushort(qRound(d: qPow(x: i / qreal(255 * 16), y: qreal(1) / gamma) * (255 * 256))); |
| 23 | } |
| 24 | |
| 25 | return cp; |
| 26 | } |
| 27 | |
| 28 | std::shared_ptr<QColorTrcLut> QColorTrcLut::fromTransferFunction(const QColorTransferFunction &fun) |
| 29 | { |
| 30 | auto cp = create(); |
| 31 | QColorTransferFunction inv = fun.inverted(); |
| 32 | |
| 33 | for (int i = 0; i <= (255 * 16); ++i) { |
| 34 | cp->m_toLinear[i] = ushort(qRound(f: fun.apply(x: i / qreal(255 * 16)) * (255 * 256))); |
| 35 | cp->m_fromLinear[i] = ushort(qRound(f: inv.apply(x: i / qreal(255 * 16)) * (255 * 256))); |
| 36 | } |
| 37 | |
| 38 | return cp; |
| 39 | } |
| 40 | |
| 41 | std::shared_ptr<QColorTrcLut> QColorTrcLut::fromTransferTable(const QColorTransferTable &table) |
| 42 | { |
| 43 | auto cp = create(); |
| 44 | |
| 45 | float minInverse = 0.0f; |
| 46 | for (int i = 0; i <= (255 * 16); ++i) { |
| 47 | cp->m_toLinear[i] = ushort(qBound(min: 0, val: qRound(f: table.apply(x: i / qreal(255 * 16)) * (255 * 256)), max: 65280)); |
| 48 | minInverse = table.applyInverse(x: i / qreal(255 * 16), resultLargerThan: minInverse); |
| 49 | cp->m_fromLinear[i] = ushort(qBound(min: 0, val: qRound(f: minInverse * (255 * 256)), max: 65280)); |
| 50 | } |
| 51 | |
| 52 | return cp; |
| 53 | } |
| 54 | |
| 55 | QT_END_NAMESPACE |
| 56 |